7661478 has 48 divisors (see below), whose sum is σ = 17217648. Its totient is φ = 2270400.

The previous prime is 7661473. The next prime is 7661483. The reversal of 7661478 is 8741667.

It is an interprime number because it is at equal distance from previous prime (7661473) and next prime (7661483).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44200 + ... + 44372.

It is an arithmetic number, because the mean of its divisors is an integer number (358701).

Almost surely, 2^7661478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7661478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8608824).

7661478 is an abundant number, since it is smaller than the sum of its proper divisors (9556170).

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

7661478 is a wasteful number, since it uses less digits than its factorization.

7661478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 250 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 7661478 is about 2767.9374992944. The cubic root of 7661478 is about 197.1382300051.

The spelling of 7661478 in words is "seven million, six hundred sixty-one thousand, four hundred seventy-eight".