78978030 has 16 divisors (see below), whose sum is σ = 189547344. Its totient is φ = 21060800.

The previous prime is 78978023. The next prime is 78978037. The reversal of 78978030 is 3087987.

It is an interprime number because it is at equal distance from previous prime (78978023) and next prime (78978037).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78978037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1316271 + ... + 1316330.

It is an arithmetic number, because the mean of its divisors is an integer number (11846709).

Almost surely, 2^78978030 is an apocalyptic number.

78978030 is an abundant number, since it is smaller than the sum of its proper divisors (110569314).

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

78978030 is a wasteful number, since it uses less digits than its factorization.

78978030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632611.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 78978030 is about 8886.9584223175. The cubic root of 78978030 is about 429.0442627430.

The spelling of 78978030 in words is "seventy-eight million, nine hundred seventy-eight thousand, thirty".