61028631 has 6 divisors (see below), whose sum is σ = 88152480. Its totient is φ = 40685748.

The previous prime is 61028621. The next prime is 61028641. The reversal of 61028631 is 13682016.

61028631 is a `hidden beast` number, since 6 + 1 + 0 + 28 + 631 = 666.

It is an interprime number because it is at equal distance from previous prime (61028621) and next prime (61028641).

It is not a de Polignac number, because 61028631 - 2¹⁰ = 61027607 is a prime.

It is a super-2 number, since 2×61028631² = 7448987603468322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61028595 and 61028604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61028621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3390471 + ... + 3390488.

It is an arithmetic number, because the mean of its divisors is an integer number (14692080).

Almost surely, 2^61028631 is an apocalyptic number.

61028631 is a deficient number, since it is larger than the sum of its proper divisors (27123849).

61028631 is a wasteful number, since it uses less digits than its factorization.

61028631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780965 (or 6780962 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 61028631 is about 7812.0823728376. The cubic root of 61028631 is about 393.7112965737.

It can be divided in two parts, 610 and 28631, that added together give a square (29241 = 171²).

The spelling of 61028631 in words is "sixty-one million, twenty-eight thousand, six hundred thirty-one".