61640430 has 32 divisors (see below), whose sum is σ = 148150944. Its totient is φ = 16413696.

The previous prime is 61640417. The next prime is 61640443. The reversal of 61640430 is 3404616.

It is an interprime number because it is at equal distance from previous prime (61640417) and next prime (61640443).

It is a super-2 number, since 2×61640430² = 7599085221169800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61640430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31974 + ... + 33846.

It is an arithmetic number, because the mean of its divisors is an integer number (4629717).

Almost surely, 2^61640430 is an apocalyptic number.

61640430 is an abundant number, since it is smaller than the sum of its proper divisors (86510514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61640430 is a wasteful number, since it uses less digits than its factorization.

61640430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 61640430 is about 7851.1419551553. The cubic root of 61640430 is about 395.0225485178.

The spelling of 61640430 in words is "sixty-one million, six hundred forty thousand, four hundred thirty".